<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Flexbox Test: align-self - stretch</title> <link rel="author" title="Intel" href="http://www.intel.com"> <link rel="author" title="Shiyou Tan" href="mailto:shiyoux.tan@intel.com"> <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-items-property" title="8.3. Cross-axis Alignment: the 'align-items' and 'align-self' properties"> <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-items-property" /> <link rel="match" href="../reference/ref-filled-green-100px-square.xht"> <meta name="assert" content="The 'align-self' property set 'stretch' makes the cross size of the item's margin box as close to the same size as the line as possible"> <style> #test { align-items: center; background-color: red; display: flex; height: 100px; width: 100px; } #test div { align-self: stretch; background-color: green; width: 25px; } </style> <body> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div id="test"> <div></div> <div></div> <div></div> <div></div> </div> </body>